Method remap

src/sql/src/plan/transform_hir.rs:337–342

Changes column references in `self` by the given remapping. Panics if a referred column is not present in `idx_map`!

(mut self, idx_map: &BTreeMap<usize, usize>)

    /// Changes column references in `self` by the given remapping.
    /// Panics if a referred column is not present in `idx_map`!
    fn remap(mut self, idx_map: &BTreeMap<usize, usize>) -> HirScalarExpr {
        self.visit_columns_referring_to_root_level_mut(&mut |c| {
            *c = idx_map[c];
        });
        self
    }
}

/// # Aims and scope